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kernel - CAM cleanup 3/N - Remove unnecessary mplocks
[dragonfly.git] / crypto / openssh / sftp-server.c
blob646286a3cda577cf4da7e07fce0b45c5136809d8
1 /* $OpenBSD: sftp-server.c,v 1.109 2016/02/15 09:47:49 dtucker Exp $ */
2 /*
3 * Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include "includes.h"
19
20 #include <sys/param.h> /* MIN */
21 #include <sys/types.h>
22 #include <sys/stat.h>
23 #ifdef HAVE_SYS_TIME_H
24 # include <sys/time.h>
25 #endif
26 #ifdef HAVE_SYS_MOUNT_H
27 #include <sys/mount.h>
28 #endif
29 #ifdef HAVE_SYS_STATVFS_H
30 #include <sys/statvfs.h>
31 #endif
32
33 #include <dirent.h>
34 #include <errno.h>
35 #include <fcntl.h>
36 #include <pwd.h>
37 #include <stdlib.h>
38 #include <stdio.h>
39 #include <string.h>
40 #include <time.h>
41 #include <unistd.h>
42 #include <stdarg.h>
43
44 #include "xmalloc.h"
45 #include "sshbuf.h"
46 #include "ssherr.h"
47 #include "log.h"
48 #include "misc.h"
49 #include "match.h"
50 #include "uidswap.h"
51
52 #include "sftp.h"
53 #include "sftp-common.h"
54
55 /* Our verbosity */
56 static LogLevel log_level = SYSLOG_LEVEL_ERROR;
57
58 /* Our client */
59 static struct passwd *pw = NULL;
60 static char *client_addr = NULL;
61
62 /* input and output queue */
63 struct sshbuf *iqueue;
64 struct sshbuf *oqueue;
65
66 /* Version of client */
67 static u_int version;
68
69 /* SSH2_FXP_INIT received */
70 static int init_done;
71
72 /* Disable writes */
73 static int readonly;
74
75 /* Requests that are allowed/denied */
76 static char *request_whitelist, *request_blacklist;
77
78 /* portable attributes, etc. */
79 typedef struct Stat Stat;
80
81 struct Stat {
82 char *name;
83 char *long_name;
84 Attrib attrib;
85 };
86
87 /* Packet handlers */
88 static void process_open(u_int32_t id);
89 static void process_close(u_int32_t id);
90 static void process_read(u_int32_t id);
91 static void process_write(u_int32_t id);
92 static void process_stat(u_int32_t id);
93 static void process_lstat(u_int32_t id);
94 static void process_fstat(u_int32_t id);
95 static void process_setstat(u_int32_t id);
96 static void process_fsetstat(u_int32_t id);
97 static void process_opendir(u_int32_t id);
98 static void process_readdir(u_int32_t id);
99 static void process_remove(u_int32_t id);
100 static void process_mkdir(u_int32_t id);
101 static void process_rmdir(u_int32_t id);
102 static void process_realpath(u_int32_t id);
103 static void process_rename(u_int32_t id);
104 static void process_readlink(u_int32_t id);
105 static void process_symlink(u_int32_t id);
106 static void process_extended_posix_rename(u_int32_t id);
107 static void process_extended_statvfs(u_int32_t id);
108 static void process_extended_fstatvfs(u_int32_t id);
109 static void process_extended_hardlink(u_int32_t id);
110 static void process_extended_fsync(u_int32_t id);
111 static void process_extended(u_int32_t id);
112
113 struct sftp_handler {
114 const char *name; /* user-visible name for fine-grained perms */
115 const char *ext_name; /* extended request name */
116 u_int type; /* packet type, for non extended packets */
117 void (*handler)(u_int32_t);
118 int does_write; /* if nonzero, banned for readonly mode */
119 };
120
121 struct sftp_handler handlers[] = {
122 /* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
123 { "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
124 { "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
125 { "read", NULL, SSH2_FXP_READ, process_read, 0 },
126 { "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
127 { "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
128 { "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
129 { "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
130 { "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
131 { "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
132 { "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
133 { "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
134 { "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
135 { "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
136 { "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
137 { "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
138 { "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
139 { "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
140 { "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
141 { NULL, NULL, 0, NULL, 0 }
142 };
143
144 /* SSH2_FXP_EXTENDED submessages */
145 struct sftp_handler extended_handlers[] = {
146 { "posix-rename", "posix-rename@openssh.com", 0,
147 process_extended_posix_rename, 1 },
148 { "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
149 { "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
150 { "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
151 { "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
152 { NULL, NULL, 0, NULL, 0 }
153 };
154
155 static int
156 request_permitted(struct sftp_handler *h)
157 {
158 char *result;
159
160 if (readonly && h->does_write) {
161 verbose("Refusing %s request in read-only mode", h->name);
162 return 0;
163 }
164 if (request_blacklist != NULL &&
165 ((result = match_list(h->name, request_blacklist, NULL))) != NULL) {
166 free(result);
167 verbose("Refusing blacklisted %s request", h->name);
168 return 0;
169 }
170 if (request_whitelist != NULL &&
171 ((result = match_list(h->name, request_whitelist, NULL))) != NULL) {
172 free(result);
173 debug2("Permitting whitelisted %s request", h->name);
174 return 1;
175 }
176 if (request_whitelist != NULL) {
177 verbose("Refusing non-whitelisted %s request", h->name);
178 return 0;
179 }
180 return 1;
181 }
182
183 static int
184 errno_to_portable(int unixerrno)
185 {
186 int ret = 0;
187
188 switch (unixerrno) {
189 case 0:
190 ret = SSH2_FX_OK;
191 break;
192 case ENOENT:
193 case ENOTDIR:
194 case EBADF:
195 case ELOOP:
196 ret = SSH2_FX_NO_SUCH_FILE;
197 break;
198 case EPERM:
199 case EACCES:
200 case EFAULT:
201 ret = SSH2_FX_PERMISSION_DENIED;
202 break;
203 case ENAMETOOLONG:
204 case EINVAL:
205 ret = SSH2_FX_BAD_MESSAGE;
206 break;
207 case ENOSYS:
208 ret = SSH2_FX_OP_UNSUPPORTED;
209 break;
210 default:
211 ret = SSH2_FX_FAILURE;
212 break;
213 }
214 return ret;
215 }
216
217 static int
218 flags_from_portable(int pflags)
219 {
220 int flags = 0;
221
222 if ((pflags & SSH2_FXF_READ) &&
223 (pflags & SSH2_FXF_WRITE)) {
224 flags = O_RDWR;
225 } else if (pflags & SSH2_FXF_READ) {
226 flags = O_RDONLY;
227 } else if (pflags & SSH2_FXF_WRITE) {
228 flags = O_WRONLY;
229 }
230 if (pflags & SSH2_FXF_APPEND)
231 flags |= O_APPEND;
232 if (pflags & SSH2_FXF_CREAT)
233 flags |= O_CREAT;
234 if (pflags & SSH2_FXF_TRUNC)
235 flags |= O_TRUNC;
236 if (pflags & SSH2_FXF_EXCL)
237 flags |= O_EXCL;
238 return flags;
239 }
240
241 static const char *
242 string_from_portable(int pflags)
243 {
244 static char ret[128];
245
246 *ret = '\0';
247
248 #define PAPPEND(str) { \
249 if (*ret != '\0') \
250 strlcat(ret, ",", sizeof(ret)); \
251 strlcat(ret, str, sizeof(ret)); \
252 }
253
254 if (pflags & SSH2_FXF_READ)
255 PAPPEND("READ")
256 if (pflags & SSH2_FXF_WRITE)
257 PAPPEND("WRITE")
258 if (pflags & SSH2_FXF_APPEND)
259 PAPPEND("APPEND")
260 if (pflags & SSH2_FXF_CREAT)
261 PAPPEND("CREATE")
262 if (pflags & SSH2_FXF_TRUNC)
263 PAPPEND("TRUNCATE")
264 if (pflags & SSH2_FXF_EXCL)
265 PAPPEND("EXCL")
266
267 return ret;
268 }
269
270 /* handle handles */
271
272 typedef struct Handle Handle;
273 struct Handle {
274 int use;
275 DIR *dirp;
276 int fd;
277 int flags;
278 char *name;
279 u_int64_t bytes_read, bytes_write;
280 int next_unused;
281 };
282
283 enum {
284 HANDLE_UNUSED,
285 HANDLE_DIR,
286 HANDLE_FILE
287 };
288
289 Handle *handles = NULL;
290 u_int num_handles = 0;
291 int first_unused_handle = -1;
292
293 static void handle_unused(int i)
294 {
295 handles[i].use = HANDLE_UNUSED;
296 handles[i].next_unused = first_unused_handle;
297 first_unused_handle = i;
298 }
299
300 static int
301 handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
302 {
303 int i;
304
305 if (first_unused_handle == -1) {
306 if (num_handles + 1 <= num_handles)
307 return -1;
308 num_handles++;
309 handles = xreallocarray(handles, num_handles, sizeof(Handle));
310 handle_unused(num_handles - 1);
311 }
312
313 i = first_unused_handle;
314 first_unused_handle = handles[i].next_unused;
315
316 handles[i].use = use;
317 handles[i].dirp = dirp;
318 handles[i].fd = fd;
319 handles[i].flags = flags;
320 handles[i].name = xstrdup(name);
321 handles[i].bytes_read = handles[i].bytes_write = 0;
322
323 return i;
324 }
325
326 static int
327 handle_is_ok(int i, int type)
328 {
329 return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
330 }
331
332 static int
333 handle_to_string(int handle, u_char **stringp, int *hlenp)
334 {
335 if (stringp == NULL || hlenp == NULL)
336 return -1;
337 *stringp = xmalloc(sizeof(int32_t));
338 put_u32(*stringp, handle);
339 *hlenp = sizeof(int32_t);
340 return 0;
341 }
342
343 static int
344 handle_from_string(const u_char *handle, u_int hlen)
345 {
346 int val;
347
348 if (hlen != sizeof(int32_t))
349 return -1;
350 val = get_u32(handle);
351 if (handle_is_ok(val, HANDLE_FILE) ||
352 handle_is_ok(val, HANDLE_DIR))
353 return val;
354 return -1;
355 }
356
357 static char *
358 handle_to_name(int handle)
359 {
360 if (handle_is_ok(handle, HANDLE_DIR)||
361 handle_is_ok(handle, HANDLE_FILE))
362 return handles[handle].name;
363 return NULL;
364 }
365
366 static DIR *
367 handle_to_dir(int handle)
368 {
369 if (handle_is_ok(handle, HANDLE_DIR))
370 return handles[handle].dirp;
371 return NULL;
372 }
373
374 static int
375 handle_to_fd(int handle)
376 {
377 if (handle_is_ok(handle, HANDLE_FILE))
378 return handles[handle].fd;
379 return -1;
380 }
381
382 static int
383 handle_to_flags(int handle)
384 {
385 if (handle_is_ok(handle, HANDLE_FILE))
386 return handles[handle].flags;
387 return 0;
388 }
389
390 static void
391 handle_update_read(int handle, ssize_t bytes)
392 {
393 if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
394 handles[handle].bytes_read += bytes;
395 }
396
397 static void
398 handle_update_write(int handle, ssize_t bytes)
399 {
400 if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
401 handles[handle].bytes_write += bytes;
402 }
403
404 static u_int64_t
405 handle_bytes_read(int handle)
406 {
407 if (handle_is_ok(handle, HANDLE_FILE))
408 return (handles[handle].bytes_read);
409 return 0;
410 }
411
412 static u_int64_t
413 handle_bytes_write(int handle)
414 {
415 if (handle_is_ok(handle, HANDLE_FILE))
416 return (handles[handle].bytes_write);
417 return 0;
418 }
419
420 static int
421 handle_close(int handle)
422 {
423 int ret = -1;
424
425 if (handle_is_ok(handle, HANDLE_FILE)) {
426 ret = close(handles[handle].fd);
427 free(handles[handle].name);
428 handle_unused(handle);
429 } else if (handle_is_ok(handle, HANDLE_DIR)) {
430 ret = closedir(handles[handle].dirp);
431 free(handles[handle].name);
432 handle_unused(handle);
433 } else {
434 errno = ENOENT;
435 }
436 return ret;
437 }
438
439 static void
440 handle_log_close(int handle, char *emsg)
441 {
442 if (handle_is_ok(handle, HANDLE_FILE)) {
443 logit("%s%sclose \"%s\" bytes read %llu written %llu",
444 emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
445 handle_to_name(handle),
446 (unsigned long long)handle_bytes_read(handle),
447 (unsigned long long)handle_bytes_write(handle));
448 } else {
449 logit("%s%sclosedir \"%s\"",
450 emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
451 handle_to_name(handle));
452 }
453 }
454
455 static void
456 handle_log_exit(void)
457 {
458 u_int i;
459
460 for (i = 0; i < num_handles; i++)
461 if (handles[i].use != HANDLE_UNUSED)
462 handle_log_close(i, "forced");
463 }
464
465 static int
466 get_handle(struct sshbuf *queue, int *hp)
467 {
468 u_char *handle;
469 int r;
470 size_t hlen;
471
472 *hp = -1;
473 if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
474 return r;
475 if (hlen < 256)
476 *hp = handle_from_string(handle, hlen);
477 free(handle);
478 return 0;
479 }
480
481 /* send replies */
482
483 static void
484 send_msg(struct sshbuf *m)
485 {
486 int r;
487
488 if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
489 fatal("%s: buffer error: %s", __func__, ssh_err(r));
490 sshbuf_reset(m);
491 }
492
493 static const char *
494 status_to_message(u_int32_t status)
495 {
496 const char *status_messages[] = {
497 "Success", /* SSH_FX_OK */
498 "End of file", /* SSH_FX_EOF */
499 "No such file", /* SSH_FX_NO_SUCH_FILE */
500 "Permission denied", /* SSH_FX_PERMISSION_DENIED */
501 "Failure", /* SSH_FX_FAILURE */
502 "Bad message", /* SSH_FX_BAD_MESSAGE */
503 "No connection", /* SSH_FX_NO_CONNECTION */
504 "Connection lost", /* SSH_FX_CONNECTION_LOST */
505 "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
506 "Unknown error" /* Others */
507 };
508 return (status_messages[MIN(status,SSH2_FX_MAX)]);
509 }
510
511 static void
512 send_status(u_int32_t id, u_int32_t status)
513 {
514 struct sshbuf *msg;
515 int r;
516
517 debug3("request %u: sent status %u", id, status);
518 if (log_level > SYSLOG_LEVEL_VERBOSE ||
519 (status != SSH2_FX_OK && status != SSH2_FX_EOF))
520 logit("sent status %s", status_to_message(status));
521 if ((msg = sshbuf_new()) == NULL)
522 fatal("%s: sshbuf_new failed", __func__);
523 if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
524 (r = sshbuf_put_u32(msg, id)) != 0 ||
525 (r = sshbuf_put_u32(msg, status)) != 0)
526 fatal("%s: buffer error: %s", __func__, ssh_err(r));
527 if (version >= 3) {
528 if ((r = sshbuf_put_cstring(msg,
529 status_to_message(status))) != 0 ||
530 (r = sshbuf_put_cstring(msg, "")) != 0)
531 fatal("%s: buffer error: %s", __func__, ssh_err(r));
532 }
533 send_msg(msg);
534 sshbuf_free(msg);
535 }
536 static void
537 send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
538 {
539 struct sshbuf *msg;
540 int r;
541
542 if ((msg = sshbuf_new()) == NULL)
543 fatal("%s: sshbuf_new failed", __func__);
544 if ((r = sshbuf_put_u8(msg, type)) != 0 ||
545 (r = sshbuf_put_u32(msg, id)) != 0 ||
546 (r = sshbuf_put_string(msg, data, dlen)) != 0)
547 fatal("%s: buffer error: %s", __func__, ssh_err(r));
548 send_msg(msg);
549 sshbuf_free(msg);
550 }
551
552 static void
553 send_data(u_int32_t id, const u_char *data, int dlen)
554 {
555 debug("request %u: sent data len %d", id, dlen);
556 send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
557 }
558
559 static void
560 send_handle(u_int32_t id, int handle)
561 {
562 u_char *string;
563 int hlen;
564
565 handle_to_string(handle, &string, &hlen);
566 debug("request %u: sent handle handle %d", id, handle);
567 send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
568 free(string);
569 }
570
571 static void
572 send_names(u_int32_t id, int count, const Stat *stats)
573 {
574 struct sshbuf *msg;
575 int i, r;
576
577 if ((msg = sshbuf_new()) == NULL)
578 fatal("%s: sshbuf_new failed", __func__);
579 if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
580 (r = sshbuf_put_u32(msg, id)) != 0 ||
581 (r = sshbuf_put_u32(msg, count)) != 0)
582 fatal("%s: buffer error: %s", __func__, ssh_err(r));
583 debug("request %u: sent names count %d", id, count);
584 for (i = 0; i < count; i++) {
585 if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
586 (r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
587 (r = encode_attrib(msg, &stats[i].attrib)) != 0)
588 fatal("%s: buffer error: %s", __func__, ssh_err(r));
589 }
590 send_msg(msg);
591 sshbuf_free(msg);
592 }
593
594 static void
595 send_attrib(u_int32_t id, const Attrib *a)
596 {
597 struct sshbuf *msg;
598 int r;
599
600 debug("request %u: sent attrib have 0x%x", id, a->flags);
601 if ((msg = sshbuf_new()) == NULL)
602 fatal("%s: sshbuf_new failed", __func__);
603 if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
604 (r = sshbuf_put_u32(msg, id)) != 0 ||
605 (r = encode_attrib(msg, a)) != 0)
606 fatal("%s: buffer error: %s", __func__, ssh_err(r));
607 send_msg(msg);
608 sshbuf_free(msg);
609 }
610
611 static void
612 send_statvfs(u_int32_t id, struct statvfs *st)
613 {
614 struct sshbuf *msg;
615 u_int64_t flag;
616 int r;
617
618 flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
619 flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
620
621 if ((msg = sshbuf_new()) == NULL)
622 fatal("%s: sshbuf_new failed", __func__);
623 if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
624 (r = sshbuf_put_u32(msg, id)) != 0 ||
625 (r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
626 (r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
627 (r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
628 (r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
629 (r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
630 (r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
631 (r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
632 (r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
633 (r = sshbuf_put_u64(msg, FSID_TO_ULONG(st->f_fsid))) != 0 ||
634 (r = sshbuf_put_u64(msg, flag)) != 0 ||
635 (r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
636 fatal("%s: buffer error: %s", __func__, ssh_err(r));
637 send_msg(msg);
638 sshbuf_free(msg);
639 }
640
641 /* parse incoming */
642
643 static void
644 process_init(void)
645 {
646 struct sshbuf *msg;
647 int r;
648
649 if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
650 fatal("%s: buffer error: %s", __func__, ssh_err(r));
651 verbose("received client version %u", version);
652 if ((msg = sshbuf_new()) == NULL)
653 fatal("%s: sshbuf_new failed", __func__);
654 if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
655 (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0 ||
656 /* POSIX rename extension */
657 (r = sshbuf_put_cstring(msg, "posix-rename@openssh.com")) != 0 ||
658 (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
659 /* statvfs extension */
660 (r = sshbuf_put_cstring(msg, "statvfs@openssh.com")) != 0 ||
661 (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
662 /* fstatvfs extension */
663 (r = sshbuf_put_cstring(msg, "fstatvfs@openssh.com")) != 0 ||
664 (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
665 /* hardlink extension */
666 (r = sshbuf_put_cstring(msg, "hardlink@openssh.com")) != 0 ||
667 (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
668 /* fsync extension */
669 (r = sshbuf_put_cstring(msg, "fsync@openssh.com")) != 0 ||
670 (r = sshbuf_put_cstring(msg, "1")) != 0) /* version */
671 fatal("%s: buffer error: %s", __func__, ssh_err(r));
672 send_msg(msg);
673 sshbuf_free(msg);
674 }
675
676 static void
677 process_open(u_int32_t id)
678 {
679 u_int32_t pflags;
680 Attrib a;
681 char *name;
682 int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
683
684 if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
685 (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
686 (r = decode_attrib(iqueue, &a)) != 0)
687 fatal("%s: buffer error: %s", __func__, ssh_err(r));
688
689 debug3("request %u: open flags %d", id, pflags);
690 flags = flags_from_portable(pflags);
691 mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
692 logit("open \"%s\" flags %s mode 0%o",
693 name, string_from_portable(pflags), mode);
694 if (readonly &&
695 ((flags & O_ACCMODE) == O_WRONLY ||
696 (flags & O_ACCMODE) == O_RDWR)) {
697 verbose("Refusing open request in read-only mode");
698 status = SSH2_FX_PERMISSION_DENIED;
699 } else {
700 fd = open(name, flags, mode);
701 if (fd < 0) {
702 status = errno_to_portable(errno);
703 } else {
704 handle = handle_new(HANDLE_FILE, name, fd, flags, NULL);
705 if (handle < 0) {
706 close(fd);
707 } else {
708 send_handle(id, handle);
709 status = SSH2_FX_OK;
710 }
711 }
712 }
713 if (status != SSH2_FX_OK)
714 send_status(id, status);
715 free(name);
716 }
717
718 static void
719 process_close(u_int32_t id)
720 {
721 int r, handle, ret, status = SSH2_FX_FAILURE;
722
723 if ((r = get_handle(iqueue, &handle)) != 0)
724 fatal("%s: buffer error: %s", __func__, ssh_err(r));
725
726 debug3("request %u: close handle %u", id, handle);
727 handle_log_close(handle, NULL);
728 ret = handle_close(handle);
729 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
730 send_status(id, status);
731 }
732
733 static void
734 process_read(u_int32_t id)
735 {
736 u_char buf[64*1024];
737 u_int32_t len;
738 int r, handle, fd, ret, status = SSH2_FX_FAILURE;
739 u_int64_t off;
740
741 if ((r = get_handle(iqueue, &handle)) != 0 ||
742 (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
743 (r = sshbuf_get_u32(iqueue, &len)) != 0)
744 fatal("%s: buffer error: %s", __func__, ssh_err(r));
745
746 debug("request %u: read \"%s\" (handle %d) off %llu len %d",
747 id, handle_to_name(handle), handle, (unsigned long long)off, len);
748 if (len > sizeof buf) {
749 len = sizeof buf;
750 debug2("read change len %d", len);
751 }
752 fd = handle_to_fd(handle);
753 if (fd >= 0) {
754 if (lseek(fd, off, SEEK_SET) < 0) {
755 error("process_read: seek failed");
756 status = errno_to_portable(errno);
757 } else {
758 ret = read(fd, buf, len);
759 if (ret < 0) {
760 status = errno_to_portable(errno);
761 } else if (ret == 0) {
762 status = SSH2_FX_EOF;
763 } else {
764 send_data(id, buf, ret);
765 status = SSH2_FX_OK;
766 handle_update_read(handle, ret);
767 }
768 }
769 }
770 if (status != SSH2_FX_OK)
771 send_status(id, status);
772 }
773
774 static void
775 process_write(u_int32_t id)
776 {
777 u_int64_t off;
778 size_t len;
779 int r, handle, fd, ret, status;
780 u_char *data;
781
782 if ((r = get_handle(iqueue, &handle)) != 0 ||
783 (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
784 (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
785 fatal("%s: buffer error: %s", __func__, ssh_err(r));
786
787 debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
788 id, handle_to_name(handle), handle, (unsigned long long)off, len);
789 fd = handle_to_fd(handle);
790
791 if (fd < 0)
792 status = SSH2_FX_FAILURE;
793 else {
794 if (!(handle_to_flags(handle) & O_APPEND) &&
795 lseek(fd, off, SEEK_SET) < 0) {
796 status = errno_to_portable(errno);
797 error("process_write: seek failed");
798 } else {
799 /* XXX ATOMICIO ? */
800 ret = write(fd, data, len);
801 if (ret < 0) {
802 error("process_write: write failed");
803 status = errno_to_portable(errno);
804 } else if ((size_t)ret == len) {
805 status = SSH2_FX_OK;
806 handle_update_write(handle, ret);
807 } else {
808 debug2("nothing at all written");
809 status = SSH2_FX_FAILURE;
810 }
811 }
812 }
813 send_status(id, status);
814 free(data);
815 }
816
817 static void
818 process_do_stat(u_int32_t id, int do_lstat)
819 {
820 Attrib a;
821 struct stat st;
822 char *name;
823 int r, status = SSH2_FX_FAILURE;
824
825 if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
826 fatal("%s: buffer error: %s", __func__, ssh_err(r));
827
828 debug3("request %u: %sstat", id, do_lstat ? "l" : "");
829 verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
830 r = do_lstat ? lstat(name, &st) : stat(name, &st);
831 if (r < 0) {
832 status = errno_to_portable(errno);
833 } else {
834 stat_to_attrib(&st, &a);
835 send_attrib(id, &a);
836 status = SSH2_FX_OK;
837 }
838 if (status != SSH2_FX_OK)
839 send_status(id, status);
840 free(name);
841 }
842
843 static void
844 process_stat(u_int32_t id)
845 {
846 process_do_stat(id, 0);
847 }
848
849 static void
850 process_lstat(u_int32_t id)
851 {
852 process_do_stat(id, 1);
853 }
854
855 static void
856 process_fstat(u_int32_t id)
857 {
858 Attrib a;
859 struct stat st;
860 int fd, r, handle, status = SSH2_FX_FAILURE;
861
862 if ((r = get_handle(iqueue, &handle)) != 0)
863 fatal("%s: buffer error: %s", __func__, ssh_err(r));
864 debug("request %u: fstat \"%s\" (handle %u)",
865 id, handle_to_name(handle), handle);
866 fd = handle_to_fd(handle);
867 if (fd >= 0) {
868 r = fstat(fd, &st);
869 if (r < 0) {
870 status = errno_to_portable(errno);
871 } else {
872 stat_to_attrib(&st, &a);
873 send_attrib(id, &a);
874 status = SSH2_FX_OK;
875 }
876 }
877 if (status != SSH2_FX_OK)
878 send_status(id, status);
879 }
880
881 static struct timeval *
882 attrib_to_tv(const Attrib *a)
883 {
884 static struct timeval tv[2];
885
886 tv[0].tv_sec = a->atime;
887 tv[0].tv_usec = 0;
888 tv[1].tv_sec = a->mtime;
889 tv[1].tv_usec = 0;
890 return tv;
891 }
892
893 static void
894 process_setstat(u_int32_t id)
895 {
896 Attrib a;
897 char *name;
898 int r, status = SSH2_FX_OK;
899
900 if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
901 (r = decode_attrib(iqueue, &a)) != 0)
902 fatal("%s: buffer error: %s", __func__, ssh_err(r));
903
904 debug("request %u: setstat name \"%s\"", id, name);
905 if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
906 logit("set \"%s\" size %llu",
907 name, (unsigned long long)a.size);
908 r = truncate(name, a.size);
909 if (r == -1)
910 status = errno_to_portable(errno);
911 }
912 if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
913 logit("set \"%s\" mode %04o", name, a.perm);
914 r = chmod(name, a.perm & 07777);
915 if (r == -1)
916 status = errno_to_portable(errno);
917 }
918 if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
919 char buf[64];
920 time_t t = a.mtime;
921
922 strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
923 localtime(&t));
924 logit("set \"%s\" modtime %s", name, buf);
925 r = utimes(name, attrib_to_tv(&a));
926 if (r == -1)
927 status = errno_to_portable(errno);
928 }
929 if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
930 logit("set \"%s\" owner %lu group %lu", name,
931 (u_long)a.uid, (u_long)a.gid);
932 r = chown(name, a.uid, a.gid);
933 if (r == -1)
934 status = errno_to_portable(errno);
935 }
936 send_status(id, status);
937 free(name);
938 }
939
940 static void
941 process_fsetstat(u_int32_t id)
942 {
943 Attrib a;
944 int handle, fd, r;
945 int status = SSH2_FX_OK;
946
947 if ((r = get_handle(iqueue, &handle)) != 0 ||
948 (r = decode_attrib(iqueue, &a)) != 0)
949 fatal("%s: buffer error: %s", __func__, ssh_err(r));
950
951 debug("request %u: fsetstat handle %d", id, handle);
952 fd = handle_to_fd(handle);
953 if (fd < 0)
954 status = SSH2_FX_FAILURE;
955 else {
956 char *name = handle_to_name(handle);
957
958 if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
959 logit("set \"%s\" size %llu",
960 name, (unsigned long long)a.size);
961 r = ftruncate(fd, a.size);
962 if (r == -1)
963 status = errno_to_portable(errno);
964 }
965 if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
966 logit("set \"%s\" mode %04o", name, a.perm);
967 #ifdef HAVE_FCHMOD
968 r = fchmod(fd, a.perm & 07777);
969 #else
970 r = chmod(name, a.perm & 07777);
971 #endif
972 if (r == -1)
973 status = errno_to_portable(errno);
974 }
975 if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
976 char buf[64];
977 time_t t = a.mtime;
978
979 strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
980 localtime(&t));
981 logit("set \"%s\" modtime %s", name, buf);
982 #ifdef HAVE_FUTIMES
983 r = futimes(fd, attrib_to_tv(&a));
984 #else
985 r = utimes(name, attrib_to_tv(&a));
986 #endif
987 if (r == -1)
988 status = errno_to_portable(errno);
989 }
990 if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
991 logit("set \"%s\" owner %lu group %lu", name,
992 (u_long)a.uid, (u_long)a.gid);
993 #ifdef HAVE_FCHOWN
994 r = fchown(fd, a.uid, a.gid);
995 #else
996 r = chown(name, a.uid, a.gid);
997 #endif
998 if (r == -1)
999 status = errno_to_portable(errno);
1000 }
1001 }
1002 send_status(id, status);
1003 }
1004
1005 static void
1006 process_opendir(u_int32_t id)
1007 {
1008 DIR *dirp = NULL;
1009 char *path;
1010 int r, handle, status = SSH2_FX_FAILURE;
1011
1012 if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1013 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1014
1015 debug3("request %u: opendir", id);
1016 logit("opendir \"%s\"", path);
1017 dirp = opendir(path);
1018 if (dirp == NULL) {
1019 status = errno_to_portable(errno);
1020 } else {
1021 handle = handle_new(HANDLE_DIR, path, 0, 0, dirp);
1022 if (handle < 0) {
1023 closedir(dirp);
1024 } else {
1025 send_handle(id, handle);
1026 status = SSH2_FX_OK;
1027 }
1028
1029 }
1030 if (status != SSH2_FX_OK)
1031 send_status(id, status);
1032 free(path);
1033 }
1034
1035 static void
1036 process_readdir(u_int32_t id)
1037 {
1038 DIR *dirp;
1039 struct dirent *dp;
1040 char *path;
1041 int r, handle;
1042
1043 if ((r = get_handle(iqueue, &handle)) != 0)
1044 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1045
1046 debug("request %u: readdir \"%s\" (handle %d)", id,
1047 handle_to_name(handle), handle);
1048 dirp = handle_to_dir(handle);
1049 path = handle_to_name(handle);
1050 if (dirp == NULL || path == NULL) {
1051 send_status(id, SSH2_FX_FAILURE);
1052 } else {
1053 struct stat st;
1054 char pathname[PATH_MAX];
1055 Stat *stats;
1056 int nstats = 10, count = 0, i;
1057
1058 stats = xcalloc(nstats, sizeof(Stat));
1059 while ((dp = readdir(dirp)) != NULL) {
1060 if (count >= nstats) {
1061 nstats *= 2;
1062 stats = xreallocarray(stats, nstats, sizeof(Stat));
1063 }
1064 /* XXX OVERFLOW ? */
1065 snprintf(pathname, sizeof pathname, "%s%s%s", path,
1066 strcmp(path, "/") ? "/" : "", dp->d_name);
1067 if (lstat(pathname, &st) < 0)
1068 continue;
1069 stat_to_attrib(&st, &(stats[count].attrib));
1070 stats[count].name = xstrdup(dp->d_name);
1071 stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
1072 count++;
1073 /* send up to 100 entries in one message */
1074 /* XXX check packet size instead */
1075 if (count == 100)
1076 break;
1077 }
1078 if (count > 0) {
1079 send_names(id, count, stats);
1080 for (i = 0; i < count; i++) {
1081 free(stats[i].name);
1082 free(stats[i].long_name);
1083 }
1084 } else {
1085 send_status(id, SSH2_FX_EOF);
1086 }
1087 free(stats);
1088 }
1089 }
1090
1091 static void
1092 process_remove(u_int32_t id)
1093 {
1094 char *name;
1095 int r, status = SSH2_FX_FAILURE;
1096
1097 if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1098 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1099
1100 debug3("request %u: remove", id);
1101 logit("remove name \"%s\"", name);
1102 r = unlink(name);
1103 status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1104 send_status(id, status);
1105 free(name);
1106 }
1107
1108 static void
1109 process_mkdir(u_int32_t id)
1110 {
1111 Attrib a;
1112 char *name;
1113 int r, mode, status = SSH2_FX_FAILURE;
1114
1115 if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1116 (r = decode_attrib(iqueue, &a)) != 0)
1117 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1118
1119 mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
1120 a.perm & 07777 : 0777;
1121 debug3("request %u: mkdir", id);
1122 logit("mkdir name \"%s\" mode 0%o", name, mode);
1123 r = mkdir(name, mode);
1124 status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1125 send_status(id, status);
1126 free(name);
1127 }
1128
1129 static void
1130 process_rmdir(u_int32_t id)
1131 {
1132 char *name;
1133 int r, status;
1134
1135 if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1136 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1137
1138 debug3("request %u: rmdir", id);
1139 logit("rmdir name \"%s\"", name);
1140 r = rmdir(name);
1141 status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1142 send_status(id, status);
1143 free(name);
1144 }
1145
1146 static void
1147 process_realpath(u_int32_t id)
1148 {
1149 char resolvedname[PATH_MAX];
1150 char *path;
1151 int r;
1152
1153 if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1154 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1155
1156 if (path[0] == '\0') {
1157 free(path);
1158 path = xstrdup(".");
1159 }
1160 debug3("request %u: realpath", id);
1161 verbose("realpath \"%s\"", path);
1162 if (realpath(path, resolvedname) == NULL) {
1163 send_status(id, errno_to_portable(errno));
1164 } else {
1165 Stat s;
1166 attrib_clear(&s.attrib);
1167 s.name = s.long_name = resolvedname;
1168 send_names(id, 1, &s);
1169 }
1170 free(path);
1171 }
1172
1173 static void
1174 process_rename(u_int32_t id)
1175 {
1176 char *oldpath, *newpath;
1177 int r, status;
1178 struct stat sb;
1179
1180 if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1181 (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1182 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1183
1184 debug3("request %u: rename", id);
1185 logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1186 status = SSH2_FX_FAILURE;
1187 if (lstat(oldpath, &sb) == -1)
1188 status = errno_to_portable(errno);
1189 else if (S_ISREG(sb.st_mode)) {
1190 /* Race-free rename of regular files */
1191 if (link(oldpath, newpath) == -1) {
1192 if (errno == EOPNOTSUPP || errno == ENOSYS
1193 #ifdef EXDEV
1194 || errno == EXDEV
1195 #endif
1196 #ifdef LINK_OPNOTSUPP_ERRNO
1197 || errno == LINK_OPNOTSUPP_ERRNO
1198 #endif
1199 ) {
1200 struct stat st;
1201
1202 /*
1203 * fs doesn't support links, so fall back to
1204 * stat+rename. This is racy.
1205 */
1206 if (stat(newpath, &st) == -1) {
1207 if (rename(oldpath, newpath) == -1)
1208 status =
1209 errno_to_portable(errno);
1210 else
1211 status = SSH2_FX_OK;
1212 }
1213 } else {
1214 status = errno_to_portable(errno);
1215 }
1216 } else if (unlink(oldpath) == -1) {
1217 status = errno_to_portable(errno);
1218 /* clean spare link */
1219 unlink(newpath);
1220 } else
1221 status = SSH2_FX_OK;
1222 } else if (stat(newpath, &sb) == -1) {
1223 if (rename(oldpath, newpath) == -1)
1224 status = errno_to_portable(errno);
1225 else
1226 status = SSH2_FX_OK;
1227 }
1228 send_status(id, status);
1229 free(oldpath);
1230 free(newpath);
1231 }
1232
1233 static void
1234 process_readlink(u_int32_t id)
1235 {
1236 int r, len;
1237 char buf[PATH_MAX];
1238 char *path;
1239
1240 if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1241 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1242
1243 debug3("request %u: readlink", id);
1244 verbose("readlink \"%s\"", path);
1245 if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1246 send_status(id, errno_to_portable(errno));
1247 else {
1248 Stat s;
1249
1250 buf[len] = '\0';
1251 attrib_clear(&s.attrib);
1252 s.name = s.long_name = buf;
1253 send_names(id, 1, &s);
1254 }
1255 free(path);
1256 }
1257
1258 static void
1259 process_symlink(u_int32_t id)
1260 {
1261 char *oldpath, *newpath;
1262 int r, status;
1263
1264 if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1265 (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1266 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1267
1268 debug3("request %u: symlink", id);
1269 logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1270 /* this will fail if 'newpath' exists */
1271 r = symlink(oldpath, newpath);
1272 status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1273 send_status(id, status);
1274 free(oldpath);
1275 free(newpath);
1276 }
1277
1278 static void
1279 process_extended_posix_rename(u_int32_t id)
1280 {
1281 char *oldpath, *newpath;
1282 int r, status;
1283
1284 if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1285 (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1286 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1287
1288 debug3("request %u: posix-rename", id);
1289 logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1290 r = rename(oldpath, newpath);
1291 status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1292 send_status(id, status);
1293 free(oldpath);
1294 free(newpath);
1295 }
1296
1297 static void
1298 process_extended_statvfs(u_int32_t id)
1299 {
1300 char *path;
1301 struct statvfs st;
1302 int r;
1303
1304 if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1305 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1306 debug3("request %u: statvfs", id);
1307 logit("statvfs \"%s\"", path);
1308
1309 if (statvfs(path, &st) != 0)
1310 send_status(id, errno_to_portable(errno));
1311 else
1312 send_statvfs(id, &st);
1313 free(path);
1314 }
1315
1316 static void
1317 process_extended_fstatvfs(u_int32_t id)
1318 {
1319 int r, handle, fd;
1320 struct statvfs st;
1321
1322 if ((r = get_handle(iqueue, &handle)) != 0)
1323 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1324 debug("request %u: fstatvfs \"%s\" (handle %u)",
1325 id, handle_to_name(handle), handle);
1326 if ((fd = handle_to_fd(handle)) < 0) {
1327 send_status(id, SSH2_FX_FAILURE);
1328 return;
1329 }
1330 if (fstatvfs(fd, &st) != 0)
1331 send_status(id, errno_to_portable(errno));
1332 else
1333 send_statvfs(id, &st);
1334 }
1335
1336 static void
1337 process_extended_hardlink(u_int32_t id)
1338 {
1339 char *oldpath, *newpath;
1340 int r, status;
1341
1342 if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1343 (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1344 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1345
1346 debug3("request %u: hardlink", id);
1347 logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
1348 r = link(oldpath, newpath);
1349 status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1350 send_status(id, status);
1351 free(oldpath);
1352 free(newpath);
1353 }
1354
1355 static void
1356 process_extended_fsync(u_int32_t id)
1357 {
1358 int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
1359
1360 if ((r = get_handle(iqueue, &handle)) != 0)
1361 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1362 debug3("request %u: fsync (handle %u)", id, handle);
1363 verbose("fsync \"%s\"", handle_to_name(handle));
1364 if ((fd = handle_to_fd(handle)) < 0)
1365 status = SSH2_FX_NO_SUCH_FILE;
1366 else if (handle_is_ok(handle, HANDLE_FILE)) {
1367 r = fsync(fd);
1368 status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1369 }
1370 send_status(id, status);
1371 }
1372
1373 static void
1374 process_extended(u_int32_t id)
1375 {
1376 char *request;
1377 int i, r;
1378
1379 if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
1380 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1381 for (i = 0; extended_handlers[i].handler != NULL; i++) {
1382 if (strcmp(request, extended_handlers[i].ext_name) == 0) {
1383 if (!request_permitted(&extended_handlers[i]))
1384 send_status(id, SSH2_FX_PERMISSION_DENIED);
1385 else
1386 extended_handlers[i].handler(id);
1387 break;
1388 }
1389 }
1390 if (extended_handlers[i].handler == NULL) {
1391 error("Unknown extended request \"%.100s\"", request);
1392 send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1393 }
1394 free(request);
1395 }
1396
1397 /* stolen from ssh-agent */
1398
1399 static void
1400 process(void)
1401 {
1402 u_int msg_len;
1403 u_int buf_len;
1404 u_int consumed;
1405 u_char type;
1406 const u_char *cp;
1407 int i, r;
1408 u_int32_t id;
1409
1410 buf_len = sshbuf_len(iqueue);
1411 if (buf_len < 5)
1412 return; /* Incomplete message. */
1413 cp = sshbuf_ptr(iqueue);
1414 msg_len = get_u32(cp);
1415 if (msg_len > SFTP_MAX_MSG_LENGTH) {
1416 error("bad message from %s local user %s",
1417 client_addr, pw->pw_name);
1418 sftp_server_cleanup_exit(11);
1419 }
1420 if (buf_len < msg_len + 4)
1421 return;
1422 if ((r = sshbuf_consume(iqueue, 4)) != 0)
1423 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1424 buf_len -= 4;
1425 if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
1426 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1427
1428 switch (type) {
1429 case SSH2_FXP_INIT:
1430 process_init();
1431 init_done = 1;
1432 break;
1433 case SSH2_FXP_EXTENDED:
1434 if (!init_done)
1435 fatal("Received extended request before init");
1436 if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1437 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1438 process_extended(id);
1439 break;
1440 default:
1441 if (!init_done)
1442 fatal("Received %u request before init", type);
1443 if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1444 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1445 for (i = 0; handlers[i].handler != NULL; i++) {
1446 if (type == handlers[i].type) {
1447 if (!request_permitted(&handlers[i])) {
1448 send_status(id,
1449 SSH2_FX_PERMISSION_DENIED);
1450 } else {
1451 handlers[i].handler(id);
1452 }
1453 break;
1454 }
1455 }
1456 if (handlers[i].handler == NULL)
1457 error("Unknown message %u", type);
1458 }
1459 /* discard the remaining bytes from the current packet */
1460 if (buf_len < sshbuf_len(iqueue)) {
1461 error("iqueue grew unexpectedly");
1462 sftp_server_cleanup_exit(255);
1463 }
1464 consumed = buf_len - sshbuf_len(iqueue);
1465 if (msg_len < consumed) {
1466 error("msg_len %u < consumed %u", msg_len, consumed);
1467 sftp_server_cleanup_exit(255);
1468 }
1469 if (msg_len > consumed &&
1470 (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
1471 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1472 }
1473
1474 /* Cleanup handler that logs active handles upon normal exit */
1475 void
1476 sftp_server_cleanup_exit(int i)
1477 {
1478 if (pw != NULL && client_addr != NULL) {
1479 handle_log_exit();
1480 logit("session closed for local user %s from [%s]",
1481 pw->pw_name, client_addr);
1482 }
1483 _exit(i);
1484 }
1485
1486 static void
1487 sftp_server_usage(void)
1488 {
1489 extern char *__progname;
1490
1491 fprintf(stderr,
1492 "usage: %s [-ehR] [-d start_directory] [-f log_facility] "
1493 "[-l log_level]\n\t[-P blacklisted_requests] "
1494 "[-p whitelisted_requests] [-u umask]\n"
1495 " %s -Q protocol_feature\n",
1496 __progname, __progname);
1497 exit(1);
1498 }
1499
1500 int
1501 sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1502 {
1503 fd_set *rset, *wset;
1504 int i, r, in, out, max, ch, skipargs = 0, log_stderr = 0;
1505 ssize_t len, olen, set_size;
1506 SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1507 char *cp, *homedir = NULL, buf[4*4096];
1508 long mask;
1509
1510 extern char *optarg;
1511 extern char *__progname;
1512
1513 ssh_malloc_init(); /* must be called before any mallocs */
1514 __progname = ssh_get_progname(argv[0]);
1515 log_init(__progname, log_level, log_facility, log_stderr);
1516
1517 pw = pwcopy(user_pw);
1518
1519 while (!skipargs && (ch = getopt(argc, argv,
1520 "d:f:l:P:p:Q:u:cehR")) != -1) {
1521 switch (ch) {
1522 case 'Q':
1523 if (strcasecmp(optarg, "requests") != 0) {
1524 fprintf(stderr, "Invalid query type\n");
1525 exit(1);
1526 }
1527 for (i = 0; handlers[i].handler != NULL; i++)
1528 printf("%s\n", handlers[i].name);
1529 for (i = 0; extended_handlers[i].handler != NULL; i++)
1530 printf("%s\n", extended_handlers[i].name);
1531 exit(0);
1532 break;
1533 case 'R':
1534 readonly = 1;
1535 break;
1536 case 'c':
1537 /*
1538 * Ignore all arguments if we are invoked as a
1539 * shell using "sftp-server -c command"
1540 */
1541 skipargs = 1;
1542 break;
1543 case 'e':
1544 log_stderr = 1;
1545 break;
1546 case 'l':
1547 log_level = log_level_number(optarg);
1548 if (log_level == SYSLOG_LEVEL_NOT_SET)
1549 error("Invalid log level \"%s\"", optarg);
1550 break;
1551 case 'f':
1552 log_facility = log_facility_number(optarg);
1553 if (log_facility == SYSLOG_FACILITY_NOT_SET)
1554 error("Invalid log facility \"%s\"", optarg);
1555 break;
1556 case 'd':
1557 cp = tilde_expand_filename(optarg, user_pw->pw_uid);
1558 homedir = percent_expand(cp, "d", user_pw->pw_dir,
1559 "u", user_pw->pw_name, (char *)NULL);
1560 free(cp);
1561 break;
1562 case 'p':
1563 if (request_whitelist != NULL)
1564 fatal("Permitted requests already set");
1565 request_whitelist = xstrdup(optarg);
1566 break;
1567 case 'P':
1568 if (request_blacklist != NULL)
1569 fatal("Refused requests already set");
1570 request_blacklist = xstrdup(optarg);
1571 break;
1572 case 'u':
1573 errno = 0;
1574 mask = strtol(optarg, &cp, 8);
1575 if (mask < 0 || mask > 0777 || *cp != '\0' ||
1576 cp == optarg || (mask == 0 && errno != 0))
1577 fatal("Invalid umask \"%s\"", optarg);
1578 (void)umask((mode_t)mask);
1579 break;
1580 case 'h':
1581 default:
1582 sftp_server_usage();
1583 }
1584 }
1585
1586 log_init(__progname, log_level, log_facility, log_stderr);
1587
1588 /*
1589 * On platforms where we can, avoid making /proc/self/{mem,maps}
1590 * available to the user so that sftp access doesn't automatically
1591 * imply arbitrary code execution access that will break
1592 * restricted configurations.
1593 */
1594 platform_disable_tracing(1); /* strict */
1595
1596 /* Drop any fine-grained privileges we don't need */
1597 platform_pledge_sftp_server();
1598
1599 if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1600 client_addr = xstrdup(cp);
1601 if ((cp = strchr(client_addr, ' ')) == NULL) {
1602 error("Malformed SSH_CONNECTION variable: \"%s\"",
1603 getenv("SSH_CONNECTION"));
1604 sftp_server_cleanup_exit(255);
1605 }
1606 *cp = '\0';
1607 } else
1608 client_addr = xstrdup("UNKNOWN");
1609
1610 logit("session opened for local user %s from [%s]",
1611 pw->pw_name, client_addr);
1612
1613 in = STDIN_FILENO;
1614 out = STDOUT_FILENO;
1615
1616 #ifdef HAVE_CYGWIN
1617 setmode(in, O_BINARY);
1618 setmode(out, O_BINARY);
1619 #endif
1620
1621 max = 0;
1622 if (in > max)
1623 max = in;
1624 if (out > max)
1625 max = out;
1626
1627 if ((iqueue = sshbuf_new()) == NULL)
1628 fatal("%s: sshbuf_new failed", __func__);
1629 if ((oqueue = sshbuf_new()) == NULL)
1630 fatal("%s: sshbuf_new failed", __func__);
1631
1632 rset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
1633 wset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
1634
1635 if (homedir != NULL) {
1636 if (chdir(homedir) != 0) {
1637 error("chdir to \"%s\" failed: %s", homedir,
1638 strerror(errno));
1639 }
1640 }
1641
1642 set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1643 for (;;) {
1644 memset(rset, 0, set_size);
1645 memset(wset, 0, set_size);
1646
1647 /*
1648 * Ensure that we can read a full buffer and handle
1649 * the worst-case length packet it can generate,
1650 * otherwise apply backpressure by stopping reads.
1651 */
1652 if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
1653 (r = sshbuf_check_reserve(oqueue,
1654 SFTP_MAX_MSG_LENGTH)) == 0)
1655 FD_SET(in, rset);
1656 else if (r != SSH_ERR_NO_BUFFER_SPACE)
1657 fatal("%s: sshbuf_check_reserve failed: %s",
1658 __func__, ssh_err(r));
1659
1660 olen = sshbuf_len(oqueue);
1661 if (olen > 0)
1662 FD_SET(out, wset);
1663
1664 if (select(max+1, rset, wset, NULL, NULL) < 0) {
1665 if (errno == EINTR)
1666 continue;
1667 error("select: %s", strerror(errno));
1668 sftp_server_cleanup_exit(2);
1669 }
1670
1671 /* copy stdin to iqueue */
1672 if (FD_ISSET(in, rset)) {
1673 len = read(in, buf, sizeof buf);
1674 if (len == 0) {
1675 debug("read eof");
1676 sftp_server_cleanup_exit(0);
1677 } else if (len < 0) {
1678 error("read: %s", strerror(errno));
1679 sftp_server_cleanup_exit(1);
1680 } else if ((r = sshbuf_put(iqueue, buf, len)) != 0) {
1681 fatal("%s: buffer error: %s",
1682 __func__, ssh_err(r));
1683 }
1684 }
1685 /* send oqueue to stdout */
1686 if (FD_ISSET(out, wset)) {
1687 len = write(out, sshbuf_ptr(oqueue), olen);
1688 if (len < 0) {
1689 error("write: %s", strerror(errno));
1690 sftp_server_cleanup_exit(1);
1691 } else if ((r = sshbuf_consume(oqueue, len)) != 0) {
1692 fatal("%s: buffer error: %s",
1693 __func__, ssh_err(r));
1694 }
1695 }
1696
1697 /*
1698 * Process requests from client if we can fit the results
1699 * into the output buffer, otherwise stop processing input
1700 * and let the output queue drain.
1701 */
1702 r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
1703 if (r == 0)
1704 process();
1705 else if (r != SSH_ERR_NO_BUFFER_SPACE)
1706 fatal("%s: sshbuf_check_reserve: %s",
1707 __func__, ssh_err(r));
1708 }
1709 }
DragonFly BSD